[cwl1979]

You've got a nut missing on the back of the tensioning device. That could be a big part of the issue. When its cold and the belts are tight it seems to charge and work ok. Once the belts warm up it gets loose and wont charge properly. It will also cause the bolt hole to be out of round and that will cause problems as well. Before digging to deep into it I personally would get a nut on that bolt and adjust the tensioner and see if that makes a difference.
 I would also check the rest of the bolts as you can see the powdery rust on the bottom bolt indicating its not as tight as it should be. The super shiny spots on the pulley also indicate belt slippage.